**Selection and application guide for Roots blower for dust conveying**
Dust conveying is a common application scenario in the industrial field, such as pneumatic conveying of particulate matter such as cement, flour, and fly ash. Roots blower has become one of the core equipment in dust conveying systems due to its stable air volume, simple structure, and easy maintenance. The following is a detailed analysis of the Roots blower for dust transportation:
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**1、 Characteristics of Roots blower for dust conveying**
**Advantages * *:
1. * * Constant air volume * *: Volumetric conveying, not affected by pressure fluctuations, ensuring stable dust transportation.
2. Wear resistant design: The impeller can be coated with wear-resistant coatings (such as tungsten carbide) or special alloys to extend its service life.
3. Oil free operation: To avoid lubricating oil contamination of the conveying medium (such as in the food and pharmaceutical industries).
4. * * Adapt to high pressure * *: Can meet the needs of long-distance (50-200 meters) or high concentration dust transportation.
**Limitations * *:
-Dust adhesion problem: High humidity dust may adhere to the impeller and needs to be cleaned regularly.
-High sealing requirements: To prevent dust from entering the bearings or gearbox, special sealing is required.
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**2、 Key selection parameters**
|* * Parameter * * | * * Description * *|
|------------------|-------------------------------------------------------------------------|
|* * Airflow (m3/min) * * | Calculated based on the amount of dust transported (e.g. 1 ton/hour of fly ash ≈ 10-15 m3/min airflow). |
|The pressure (kPa) depends on the length of the pipeline and the number of bends (generally 9.8~58.8kPa, with higher pressure required for long distances). |
|* * Material * * | Cast iron (ordinary dust), stainless steel (corrosive dust), wear-resistant coating (high wear condition). |
|* * Sealing method * * | Mechanical seal (anti dust leakage), labyrinth seal (wear-resistant). |
|Explosion proof requirements: Flammable dust (such as aluminum powder and coal powder) should be selected with an explosion-proof motor (Exd IIB T4). |
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**3、 Recommended configuration**
**1. Wear resistant Roots blower**
-Impeller Material: Spray coated tungsten carbide or nickel based alloy.
-* * Applicable scenarios * *: High wear media such as cement, mineral powder, quartz sand, etc.
-* * Brand Example * *:
-Domestic: Shandong (- W series), Jiangsu (HC-DM series).
-Import: (Taiko RBS-W).
**2. Explosion proof Roots blower**
-Explosion proof certification: Exd IIB T4 (applicable to flammable dust).
-Applicable scenarios: coal powder, aluminum powder, flour mills, etc.
-Brand example: Zhejiang (- Ex series).
**3. Stainless steel Roots blower**
-Material: 304/316L stainless steel.
-* * Applicable scenarios * *: Chemical dust, corrosive gases (such as chlorides).
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**4、 System design considerations**
1. Pipeline optimization**
-Reduce the number of bends (each 90 ° bend ≈ increases pipeline resistance by 10 meters).
-Smooth inner walls of pipelines (such as stainless steel pipes) reduce frictional resistance.
2. Dust removal and filtration**
-Install a cyclone separator or a bag filter at the air inlet to prevent dust from entering the fan.
-The air outlet can be equipped with a silencer and dust collection device.
3. * * Anti blocking measures**
-Install a vibrating screen or an airflow blowing device at the inlet of the fan to prevent dust accumulation.
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**5、 Maintenance and troubleshooting**
**1. Daily maintenance**
|* * Project * * | * * Operation * *|
|-------------------|-------------------------------------------------------------------------|
|* * Clean the impeller * * | Check the dust adhesion every month and shut down for cleaning if necessary. |
|* * Check the seal * * | Check if the mechanical seal is leaking air and if the lubricating grease is contaminated (replace every 3 months). |
|* * Monitoring vibration * * | Abnormal vibration may indicate impeller wear or bearing damage. |
**2. Common faults**
|* * Fault phenomenon * * | * * Cause * * | * * Solution * *|
|-------------------|---------------------------------------|---------------------------------------|
|* * Decreased air volume * * | Filter blockage/impeller wear | Clean the filter, repair or replace the impeller. |
|Bearing overheating | Dust entering the bearing/insufficient lubrication | Replace the seal and replenish lubricating grease. |
|* * Abnormal noise * * | Impeller collision (dust accumulation leads to reduced clearance) | Stop the machine for cleaning and adjust the impeller clearance. |
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**6、 Brand and Price Reference**
|* * Brand/Model * * | * * Power * * | * * Price (RMB) * * | * * Features * *|
|---------------------|----------|-------------------|-----------------------------------|
|Shandong -75 * * | 7.5kW | 22000~28000 | Wear resistant coating, suitable for cement dust. |
|Jiangsu HC-50DM * * | 15kW | 35000~45000 | Explosion proof design, dedicated for coal powder transportation. |
|RBS-75W * * | 7.5kW | 60000~80000 | High wear-resistant alloy impeller with long service life. |
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**7、 Selection Summary**
1. * * Ordinary dust * * (such as cement, flour): Choose * * cast iron+wear-resistant coating * * (20000~30000).
2. * * Flammable dust * * (such as coal powder and aluminum powder): * * Explosion proof models * * (30000~50000) must be selected.
3. Corrosive dust (such as chemical waste): Choose stainless steel material (35000~60000).
**Tip: Provide information such as dust type, conveying distance, concentration, etc., to recommend more accurate models!
